Brightness control circuit and backlight control module

Electric lamp and discharge devices: systems – Current and/or voltage regulation

Reexamination Certificate

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Details

C315S149000, C315S157000, C315S158000, C315S159000

Reexamination Certificate

active

07397202

ABSTRACT:
A brightness control circuit is used to control brightness of a light emitting module. A light sensor module generates a first current through itself according to a light intensity. A charging module is coupled between the light sensor module and the ground, and generates a charging voltage at a voltage node according to the first current. A voltage control circuit comprises a reference voltage source, a comparator and a diode. The reference voltage source provides a reference voltage. The comparator has a non-inverse input terminal coupled to the reference voltage source, an inverse input terminal coupled to the voltage node, and an output terminal. The comparator outputs a comparative signal according to the reference voltage and the charging voltage. The diode is coupled between the inverse input terminal and the output terminal. The switch is coupled to the voltage control circuit and provides a second current through the light emitting module according to the comparative signal.

REFERENCES:
patent: 6538394 (2003-03-01), Volk et al.
patent: 7245090 (2007-07-01), Yang

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